What is the area of the shaded region? ?

Hi!

The area of the shaded region is
The area of the whole triangle - the area of the smaller triangle

So first let's find the area of the whole triangle. 
a = 0.5bh
a = 0.5·5·12
a = 2.5·12
a = 30

Now find the area of the smaller triangle.
a = 0.5bh
a = 0.5·3·4
a = 1.5·4
a = 6

30 - 6 = 24

The answer is 24mm

Hope this helps! :)
-Peredhel

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12